MIT Mystery Hunt Puzzle Index: Keyword Data

magnet logic puzzles

In the standard form of this puzzle, a grid is broken up into 2-cell regions, some of which are to be filled in with a + in one cell and a - in the other, so that the total number of +s and the total number of -s in each row and column equal the numbers given outside the grid, and two of the same symbol are never in orthogonally adjacent cells.